1 | /* |
2 | * |
3 | * Copyright (c) 2004 |
4 | * John Maddock |
5 | * |
6 | * Use, modification and distribution are subject to the |
7 | * Boost Software License, Version 1.0. (See accompanying file |
8 | * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
9 | * |
10 | */ |
11 | |
12 | /* |
13 | * LOCATION: see http://www.boost.org for most recent version. |
14 | * FILE static_mutex.hpp |
15 | * VERSION see <boost/version.hpp> |
16 | * DESCRIPTION: Declares static_mutex lock type, there are three different |
17 | * implementations: POSIX pthreads, WIN32 threads, and portable, |
18 | * these are described in more detail below. |
19 | */ |
20 | |
21 | #ifndef BOOST_REGEX_STATIC_MUTEX_HPP |
22 | #define BOOST_REGEX_STATIC_MUTEX_HPP |
23 | |
24 | #include <boost/config.hpp> |
25 | #include <boost/regex/config.hpp> // dll import/export options. |
26 | |
27 | #ifdef BOOST_HAS_PTHREADS |
28 | #include <pthread.h> |
29 | #endif |
30 | |
31 | #if defined(BOOST_HAS_PTHREADS) && defined(PTHREAD_MUTEX_INITIALIZER) |
32 | // |
33 | // pthreads version: |
34 | // simple wrap around a pthread_mutex_t initialized with |
35 | // PTHREAD_MUTEX_INITIALIZER. |
36 | // |
37 | namespace boost{ |
38 | |
39 | class static_mutex; |
40 | |
41 | #define BOOST_STATIC_MUTEX_INIT { PTHREAD_MUTEX_INITIALIZER, } |
42 | |
43 | class BOOST_REGEX_DECL scoped_static_mutex_lock |
44 | { |
45 | public: |
46 | scoped_static_mutex_lock(static_mutex& mut, bool lk = true); |
47 | ~scoped_static_mutex_lock(); |
48 | inline bool locked()const |
49 | { |
50 | return m_have_lock; |
51 | } |
52 | inline operator void const*()const |
53 | { |
54 | return locked() ? this : 0; |
55 | } |
56 | void lock(); |
57 | void unlock(); |
58 | private: |
59 | static_mutex& m_mutex; |
60 | bool m_have_lock; |
61 | }; |
62 | |
63 | class static_mutex |
64 | { |
65 | public: |
66 | typedef scoped_static_mutex_lock scoped_lock; |
67 | pthread_mutex_t m_mutex; |
68 | }; |
69 | |
70 | } // namespace boost |
71 | #elif defined(BOOST_HAS_WINTHREADS) |
72 | // |
73 | // Win32 version: |
74 | // Use a 32-bit int as a lock, along with a test-and-set |
75 | // implementation using InterlockedCompareExchange. |
76 | // |
77 | |
78 | #include <boost/cstdint.hpp> |
79 | |
80 | namespace boost{ |
81 | |
82 | class BOOST_REGEX_DECL scoped_static_mutex_lock; |
83 | |
84 | class static_mutex |
85 | { |
86 | public: |
87 | typedef scoped_static_mutex_lock scoped_lock; |
88 | boost::int32_t m_mutex; |
89 | }; |
90 | |
91 | #define BOOST_STATIC_MUTEX_INIT { 0, } |
92 | |
93 | class BOOST_REGEX_DECL scoped_static_mutex_lock |
94 | { |
95 | public: |
96 | scoped_static_mutex_lock(static_mutex& mut, bool lk = true); |
97 | ~scoped_static_mutex_lock(); |
98 | operator void const*()const |
99 | { |
100 | return locked() ? this : 0; |
101 | } |
102 | bool locked()const |
103 | { |
104 | return m_have_lock; |
105 | } |
106 | void lock(); |
107 | void unlock(); |
108 | private: |
109 | static_mutex& m_mutex; |
110 | bool m_have_lock; |
111 | scoped_static_mutex_lock(const scoped_static_mutex_lock&); |
112 | scoped_static_mutex_lock& operator=(const scoped_static_mutex_lock&); |
113 | }; |
114 | |
115 | } // namespace |
116 | |
117 | #else |
118 | // |
119 | // Portable version of a static mutex based on Boost.Thread library: |
120 | // This has to use a single mutex shared by all instances of static_mutex |
121 | // because boost::call_once doesn't alow us to pass instance information |
122 | // down to the initialisation proceedure. In fact the initialisation routine |
123 | // may need to be called more than once - but only once per instance. |
124 | // |
125 | // Since this preprocessor path is almost never taken, we hide these header |
126 | // dependencies so that build tools don't find them. |
127 | // |
128 | #define BOOST_REGEX_H1 <boost/thread/once.hpp> |
129 | #define BOOST_REGEX_H2 <boost/thread/recursive_mutex.hpp> |
130 | #define BOOST_REGEX_H3 <boost/thread/lock_types.hpp> |
131 | #include BOOST_REGEX_H1 |
132 | #include BOOST_REGEX_H2 |
133 | #include BOOST_REGEX_H3 |
134 | #undef BOOST_REGEX_H1 |
135 | #undef BOOST_REGEX_H2 |
136 | #undef BOOST_REGEX_H3 |
137 | |
138 | namespace boost{ |
139 | |
140 | class BOOST_REGEX_DECL scoped_static_mutex_lock; |
141 | extern "C" BOOST_REGEX_DECL void boost_regex_free_static_mutex(); |
142 | |
143 | class BOOST_REGEX_DECL static_mutex |
144 | { |
145 | public: |
146 | typedef scoped_static_mutex_lock scoped_lock; |
147 | static void init(); |
148 | static boost::recursive_mutex* m_pmutex; |
149 | static boost::once_flag m_once; |
150 | }; |
151 | |
152 | #define BOOST_STATIC_MUTEX_INIT { } |
153 | |
154 | class BOOST_REGEX_DECL scoped_static_mutex_lock |
155 | { |
156 | public: |
157 | scoped_static_mutex_lock(static_mutex& mut, bool lk = true); |
158 | ~scoped_static_mutex_lock(); |
159 | operator void const*()const; |
160 | bool locked()const; |
161 | void lock(); |
162 | void unlock(); |
163 | private: |
164 | boost::unique_lock<boost::recursive_mutex>* m_plock; |
165 | bool m_have_lock; |
166 | }; |
167 | |
168 | inline scoped_static_mutex_lock::operator void const*()const |
169 | { |
170 | return locked() ? this : 0; |
171 | } |
172 | |
173 | inline bool scoped_static_mutex_lock::locked()const |
174 | { |
175 | return m_have_lock; |
176 | } |
177 | |
178 | } // namespace |
179 | |
180 | #endif |
181 | |
182 | #endif |
183 | |